Be able to view / delete existing reminders

[OldStarchy]

pls

[OldStarchy]

list reminders with !listreminders and delete one by index with !deletereminder <index>

OldStarchy:
!listreminders

DashBot:
1: at 9:00 PM (in 11 minutes): this is a test
2: at 9:00 PM (in 11 minutes): this is a test 3
3: at 9:00 PM (in 11 minutes): this is a test 2

OldStarchy:
!deletereminder 2

DashBot:
oke

OldStarchy:
!listreminders

DashBot:
1: at 9:00 PM (in 11 minutes): this is a test
2: at 9:00 PM (in 11 minutes): this is a test 2

[OldStarchy]

Needs documentation